LAS VEGAS  Gamblers fled the casino floor as firefighters rushed up flights of stairs, but remarkably no one was seriously injured in a blaze that blackened the top floors of the 32-story Monte Carlo hotel-casino.

The 3,000-room resort was at near capacity Friday when the fire broke out midmorning, sending guests and employees onto the Las Vegas Strip where ashes and embers rained.

The blaze was contained within an hour.

An ambulance company spokeswoman said 17 people were taken to area hospitals with minor injuries, mostly from inhaling smoke or from fleeing the building. None of the 120 firefighters who fought the blaze was hurt.

The spectacle brought to mind the state's deadliest fire. In 1980, 87 people were killed in a fire at the old MGM Grand just down the street from the Monte Carlo.

Strict fire codes, including mandatory fire sprinklers, have since been adopted for the casinos on the Las Vegas Strip.

He called it an exterior fire that consumed a foam-like building material. He said it was best fought from the interior. Firefighters entered top-floor rooms, broke windows and leaned out with hoses to aim water at the flames.

"It's very precarious up there," Smith said. "They did expose themselves to some extreme danger. They could have fallen out."

Smith said it was too early to assess damage or say what caused the fire, which began just before 11 a.m. There was no immediate indication of criminal activity or arson, but "nothing is ruled out at this time," he said.

Officials were told welders were working on the roof of the building before the fire, Clark County spokesman Erik Pappa said.

Ron Lynn, chief of the county Building Department, said five floors were affected by the fire, mostly from water damage, but only a few rooms had significant damage from fire and water.

Officials went door-to-door evacuating the hotel, said Gordon Absher, a spokesman for the resort's owner, MGM Mirage Inc.

Larry Wappel, 25, said he and his brother were in a room on the 30th floor when they heard housekeeping staff banging on doors and yelling "Fire, get out!" He said it took about 10 minutes to walk single-file down the stairs.

"There were a couple of ladies crying, but it was pretty calm," he said.

Another guest, Renza Badilla, 45, said she exited through the hotel kitchen to find burning debris and embers falling from the roof.

"I think people were shocked when they saw the smoke," she said.

Guests were taken to the MGM Grand Garden Arena and were being moved to other MGM Mirage hotels in Las Vegas, Absher said. Late Friday, some guests were escorted to their hotel rooms to retrieve their belongings, he said. The top six floors remained closed to guests.

Lynn said it's possible the casino would reopen ahead of the hotel but he said that would not happen immediately.

"We're going to recommission as if it would be a new building," he said.

An estimated 900 hotel workers on duty when the fire began were evacuated to the adjacent New York-New York hotel.

Huge crowds formed to watch the fire, and traffic on the Las Vegas Strip was gridlocked as streets were blocked off around the hotel. Nearby resorts were not evacuated.

The Monte Carlo Resort & Casino has 3,002 guest rooms and 211 suites. The resort, on Las Vegas Boulevard near Tropicana Avenue, opened in June 1996 and is modeled after the Place du Casino in Monte Carlo, Monaco.

The Monte Carlo hotel-casino shows serious damage after a fire is nearly put out, Friday, Jan. 25, 2008 in Las Vegas. The fire, which was reported around 11 a.m., spread from the center section of the hotel across the roof before appearing to ease about an hour later. (AP Photo/Eric Jamison)